Four explorers are summoned to Peru by the brilliant physicist Dr Thorkel. They discover a rich source of radium and a half-mad Thorkel who shrinks them down to one-fifth their normal size when they threaten to stop his unorthodox experimentation.
loss of eyesight experiment peru expedition amazon rainforest shrinking radium mad scientist murder laboratory miniaturization miniature people biologist radium mine research laboratory scientists big gigantic peruvian jungle
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